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BUY DS1302ZN https://www.utsource.net/itm/p/794190.html
Trickle-Charge Timekeeping Chip
The DS1302ZN is a Real Time Clock (RTC) IC manufactured by Dallas Semiconductor. It is a low-power, full binary-coded decimal (BCD) clock/calendar plus 56 bytes of NV SRAM. Features: * Low power consumption * Operates from a 3V to 5.5V supply * 56 bytes of battery-backed NV SRAM * Clock/calendar provides seconds, minutes, hours, day, date, month, and year information * Leap year compensation valid up to 2100 * Programmable square-wave output signal Applications: * Digital clocks * Time-stamping * Time tracking * Data logging * Battery-backed memory (For reference only)